Quick answer: Cloudiness usually comes from trapped air bubbles and tiny dissolved minerals. As ordinary freezer ice freezes from the outside inward, remaining air and impurities become concentrated in the center.
What to know
Cloudy ice is usually safe when made with drinkable water. Clarity by itself is not a reliable test of whether water is safe.
Practical tips
Use clean trays, fresh drinkable water, and a freezer free of odors. For clearer cubes, directional freezing can encourage bubbles to collect in the part you trim away.
Frequently asked question
Does boiling water guarantee clear ice?
No. Boiling can release some dissolved gases, but the freezing direction and water composition still matter.
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